Landon Curt Noll
4ee4c731f7
While not strictly necessary, replacing the two ASCII tab characters in the markdown copyright comment makes it easier to detect problematic TAB indentation within markdown files. After this commit, only 90 markdown files have leading ASCII TAB characters. And again, while not strictly necessary, we can consider running expand on those 90 markdown files to see what effect that might have on the HTML files they produce. Replace leading ASCII TAB characters with multiples of 8 ASCII SPACE characters (the default action of the `expand(1)` tool) might have an negative effect on some HTML formatting where **hack-a-round** formatting was attempted to fix broken indentation caused by problematic ASCII TAB characters. Think of this as a baseline for evaluating leading TAB characters within markdown files. TODO: Consider either using `expand(1)` to replace leading ASCII TAB characters with multiples of 8 ASCII SPACE characters AND/OR modifying the appropriate `bin` tool to convert leading ASCII TAB characters into multiples of 8 ASCII SPACE characters.
2.1 KiB
2.1 KiB
To build:
make
To use:
./prog
Try:
./try.sh
By default that will use indent(1) found by the shell type -P indent and
sed(1) found by the shell type -P sed but if you want to change these, say
to try a different beautifier, you can do it like:
INDENT=bcpp ./try.sh
which would change it to use bcpp(1) instead of indent(1). Do similar for
sed(1) only use the name SED.
Judges' remarks:
C11 features definitely help this entry to be as concise as it is.
The judges would like to think that they had almost understood how this entry works.
If you win a bet by demonstrating this entry, please let us know.
Author's remarks:
Remarks
- Computes the factorial function.
- No loops, no explicit recursion.
- Untyped C without any casts, using a
wword datatype. - Varargs not essential,
w(*)(w,w*)works just as well. - Conforming to ISO C.
- No warnings when compiled with
-std=c99 -Wall -Wextra -pedantic. - Comments in the code explain what this really is about.
- C as a functional programming language: untyped lambda calculus compiled to executable C functions.
- Untagged closures (just a function pointer followed by some values).
- Recursion implemented through Curry's paradoxical combinator
Y. - The readable implementation of
Yis on lines 29-30:
W_f = \x.f(xx)
Y = \f.W_f W_f
- A mixture of strict and lazy evaluation, with a
_force function (John Tromp notes that if Turing's fixed-point combinator(\xy.y\z.xxyz)(\xy.y\z.xxyz)had been used, all applications could have been strict). - Uses
Yto implement factorial on nativeints. - 10! seconds = 6 weeks.
- Answers the ultimate question of life, the universe and everything.